Process of draining and utilizing slime.



TATEb PATENT FELIX RICHTER, OF FRKNKEORT-ON-THE-MAIN, GERMANY.

PROCESS OF DRAINING AND UTILIZING SLIME.

No Drawing.

and consists in the treatment of the slime by intermixing it with finely-divided active carbon (to be later described) "and then aerating it by some oxygen-containing gas. The result of this treatment is that the slime readily gives oil the contained water, so that, after such water has beenremoved by pressing or in any other manner, there remains a slime material with a very small proportion of water. This material cambo'pressed directly into cakes of any'desired s ape without previous drying-and the cakes can be used as fuel, or, after having been reduced to owder, as a fertilizer.

y active carbon 1 mean a carbon adapted to condense gases on the'surface of its 1 articles, preferably the carbonaceous residue obtained by the dry distillation, with exclusion of air, of a carbon-containin material, such as brown coal, mixed with finelydivided mineral substances, such as city or ashes. The dry slime produced by the pres- ,ent'process can itself be advantageously used as a suitable carbon-containing material. The finely-divided active carbon produced in this manner has the property of condensrticles the air or ing on the surface of its introduced into the oxygen-containing gases mixture, thereby enabling a strong oxidation of the impurities in the slime-mixture to be eflected; and moreover has the property of mechanically attracting and holding the oxidized impurities in the slime.

In carrying out the invention, 20 to 40 kg. of active carbon can be used for 1000 kg. of shine with about 90 per cent. of water. The active carbon may be thoroughly intermixed with theslime by blowing finely-dividedair into the mass. The addition of thefinelydivided active material results partly in the colloids and other sus ended substances in the slime being held ast and concentrated by the active material, owing to the surface attraction; and also in the decompcsition of Specification of Letters Iatent. Application filed November 23', 1910. Serial No. 593,954..

Patented June 1'27, ED1 15 3.

the colloids by oxidation due to the aeration in presence of the active carbon material, so

.that the water is released and can escape and a slime product is obtained which is no longer liable to putrefaction. which does not flow away automatically can be separated, down to a small percentage,

means of any well known separating do ice (such as a press, centrifugal machine or the like), so that practically a completely dry material isproduced. The said material can then be pressed at once into cakes of a given shape and reduced for the purpose of using it as fertilizer, or subjected to a dry distillation for the ur ose of usin it-for the draining of further quantities of slime.

The dewatering of slime in accordance with the process above described can be facilitated by adding any well known coagulant, such as caustic alkali, sulfate of aluminum, chlorid of lime and-the like.

What I claim is:

1. The process of dewatering slime, which comprises mixing the slime with the finelydivided residue of the heat treatment of carbon containing material, and then subjecting the mixture to the action of an oxygen containing gas.

2. The process of dewatering slime, which comprises mixing the slime with the finelydivided residue of the dry distillation of carbon-containing material, and then subjecting the mixture to the action of an oxygen-containing gas.

3. The process of dewateringslime, which comprises mixing the slime with the finely divided residue of the dry distillation of a mixture of finely-divided carbon-containing material and mineral matter, and then subjecting-themixture to the action of an oxy gen-containing gas.

4:. The process of treating slime, which comprises treating the slime with the finel divided residue of the heat-treatment of carbon-containing materials, subjecting the' mixture to the action of an oxygen-containing gas, and then pressing the residue, without previous drying, into solid pieces.

5. The process of treating slime, which comprises mixing the slime with a residue of t 0 dry. distillation of carbon-containing material, subjecting the mixture 'to the action of an oxygen-containing gas, and then subjecting the mixture to pressure, without previous rying, to form it into solid pieces.

The water 6. The process of treating slime, which In testimony whereof, I afiix my signature (ciomgrises mixing tfhe same with the finelyj; in presence of two Witnesses.

ivi ed residue 0 the heat-treatment 0 r carbon-containing materials, aerating the V FELIX RICHFER' mixture, pressing into solid pieces, Without Witnesses: previous drying, and then reducing such JEAN GRUND, pieces to powder. CARL GRUND.

(Icpies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, C. 

